16.5 hp kohler motor on a craftsman mower. Can the flywheel magnets go bad? If so how do you check them. We have replaced coil,elec box, switch. The gap is 0.010 on the coil. It's not on upside down. The keyway isn't sheered. My dad and I are usually pretty good on this kind of stuff and the magnets are the only thing we can figure. We've eliminated all the safety switches.